How to use LFRC for DTM example?

[Centurion]

Our board doesn't have LFXO, but I want to run DTM. When I try to switch to LFRC by changing sdk_config.h, it doesn't take effect.

chip: nRF52832

SDK: nRF5_SDK_17.0.2

#ifndef NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_SRC 0
#endif

#ifndef NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_CTIV 16
#endif

#ifndef NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_CTIV 16
#endif

#ifndef NRF_SDH_CLOCK_LF_ACCURACY
#define NRF_SDH_CLOCK_LF_ACCURACY 1
#endif

[Håkon Alseth]

Hi,

 

Our board doesn't have LFXO, but I want to run DTM. When I try to switch to LFRC by changing sdk_config.h, it doesn't take effect.

chip: nRF52832

SDK: nRF5_SDK_17.0.2

The direct_test_mode example in nRF5 sdk does not have a specific dependency on the LFCLK, as it does not use the softdevice or any app_timer/rtc instances. It uses the HFXO (HFCLK) for time keeping and radio communication.

 

That being said, if you use the nrf_clock API, the correct config definitions are prefixed NRF_CLOCK_*. "NRF_SDH_*" is the configuration that you provide to the softdevice.

 

Kind regards,

Håkon